The Model Based Method relies upon the development of a set of mutual
dependant models. All models are subject to the generic and iterative modelling
phase of analysis, design, and evaluation. The consequence is that the design
team can leave one perspective and switch to another at any time in the
development cycle, since the modification of one model implicitly affects the
other models. Thus, problems abandoned in one perspective can be solved
implicitly from another perspective.

The method can be conceptually heavy for the developers. The main reason for
this is the employment of multiple perspectives to the interactive system to be
developed. Despite this, the development team appreciated the method because
the models served as a concise communication medium. Both users, other
experts, and members of the development team can discuss the various models
and discover unnecessary, erroneous or lacking concepts at an early stage in the
development cycle - even before prototypes are developed.

The budget of STOY is 500.000 ECU. Four people have been involved in the
development team. The project is on schedule regarding both time and budget
constraints. The system is when writing in phase 8.

The method is now being used by two other projects. The first project aims at
making a navigational aid system for blind people. The second project designs
and tests prototypes and existing information- and communication systems for
truck drivers. Both projects share the navigation task, but the user and the
domain are slightly different. Thus, the task and domain models in the former
project were reused and slightly modified in the latter project because of a
different user profile.

In a third project we are searching for an effective development method for
multi-modal user interface systems. The method will be reviewed in this project.

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